Rod mod intake from gpi would be the best bang for the buck. You send them the old one and it would cost you 1/3 the price of those other manifolds.
Only other one worth dropping money on is the lod with a 102 opening. But that combo cost a lot more for such a little gain over rod mod. Ported throttle body is also a cheap upgrade that I think is worth it. It increased my throttle response nicely.
But converters are a huge upgrade on our cars.
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2012 Camaro 2SS/RS - CSP Custom Cam 232/240 .615/.615 113 +3, Texas speed CNC heads, FTI billet triple disc converter, K&N cai, Katech ported TB, GPI Ported/rod modded manifold, Texas speed 1 7/8 headers, HFC, Flowmaster 2 chambers with x pipe, Mishimoto CC, MSD wires, Roto fab washer relocation, tru cool 40k trans cooler, apex scoop, Pedders extreme coil overs and much more!!
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